Is it wrong that I'm inlove with my dad's friend, and want to date him?

My dad grew up with this guy and I've known him since I was 9. I'm 18 now and he is 37. We talk a lot since forever right. We opened up about how we feel about each other a year ago and in a way it feels so right but also wrong and I'm not sure if it will look bad dating a guy 19 years older than me and I also don't want to hurt my dad or family. This guy has been very open like he said he will wait 20 year if he has to to be with me and he isn't embarrassed about it like he is willing to tell my dad he likes me.

Is it wrong that I'm inlove with my dad's friend, and want to date him?
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